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Morphology and ontogeny of an Early Devonian phacopid trilobite with reduced sight from southern Thailand

Published online by Cambridge University Press:  20 May 2016

Catherine Crônier  and
Richard A. Fortey
Catherine Crônier
Affiliation:
USTL Sciences de la Terre, Laboratoire de Paléontologie et Paléogéographie du Paléozoïque, UMR 8014 et FR 1818 du CNRS, 59655 Villeneuve d'Ascq Cedex, France,
Richard A. Fortey
Affiliation:
Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom,
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Abstract

Exuviae comprising immature growth stages allow the tracing of morphological and morphogenetical features of the reduced-eyed phacopid species Plagiolaria poothaii Kobayashi and Hamada, 1968, from the Early Devonian of Satun Province, southern Thailand. Biometric and morphometric approaches have been used to characterize the shape changes. This is the fourth phacopid genus for which ontogenetic information is known. Ontogenetic features of this species are generally similar to those of Phacops and Weyerites. However, the ankylosis of the facial sutures occurs at the end of the meraspid period, later than in Phacops, and this is probably a derived character.

Type
Research Article
Information
Journal of Paleontology , Volume 80 , Issue 3 , May 2006 , pp. 529 - 536
Copyright
Copyright © The Paleontological Society 

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